Las Casillas, Spain offers 1 beach perfect for sunbathing, surfing, swimming, and more. Las Casillas, Castilla and Leon, Spain, is known for its proximity to the Sierra de Gredos mountain range, which attracts nature enthusiasts and hikers. The best time to travel to Las Casillas, Spain, is in late spring or early fall when the average air temperature is around 70°F (21°C) and the water temperature is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!